This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 85 |
| 4 | 961 |
| 5 | 13041 |
| 6 | 207001 |
| 7 | 3746149 |
| 8 | 75832065 |
| 9 | 1693615681 |
| 10 | 41302616041 |
| 11 | 1090835399061 |
| 12 | 30988423000129 |
| 13 | 941461990360945 |
| 14 | 30439632977968761 |
| 15 | 1042973073239321701 |
| 16 | 37731609890300935681 |
| 17 | 1436586994020158747649 |